Replace or repair Pentair Superflow single speed

I have a 1 HP Pentair Superflow (model 340038) pump that has become progressively louder this summer. I checked the impeller for debris (just reaching what I could through the strainer opening), and found nothing. I have not taken anything apart. The pump appears to move water just fine based on pressure and what I feel coming out of the returns. It does not seem to be vibrating or heating up more than normal. Putting pressure on various parts of the pump does not seem to affect the noise...

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